 So here's my take. As cannabis grows in popularity and becomes legal in more states, we continue to learn more about its reported benefits as well as its risks or downsides. It's a basic principle of pharmacology that if a drug or substance has good effects, there can also be negative effects. So always consider the pros and the cons. And don't assume that because something is natural that it is completely safe. With Your Body, I'm ABC's Dr. Jennifer Ashton.